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Testing for Population mean.
The average fee charged by a large accounting firm to prepare an individual income tax return is $250 and the standard deviation (σ) is $12. Joan Smith is a CPA who works for the firm and her supervisor thinks she may be charging her clients significantly more for their tax returns. On a random sample of 40 tax returns that Joan completed last year, the average cost was $270. Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
At the 0.10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
Select the variable team salary and find the mean, median, and the standard deviation
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
Mention your decision regarding the null hypothesis. If H 0 rejected can we conclude that treatment 2 and treatment 3 differ? Use 95 percent level of confidence.
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
If the agency is risk neutral, use a decision tree to determine its best course of action.
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Find the area under the normal distribution curve to the right of z = -1.03.
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. The null hypothesis of equality of means is rejected. What conclusion can be made f..
Dinner B which costs $135.30 for dinner submitted by salesperson with mean cost of $117.50 and standard deviation of $30 per dinner?
Construct a 95 percent confidence interval for the true mean.
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